88 lines
1.2 KiB
Plaintext
88 lines
1.2 KiB
Plaintext
; The OS/K Team licenses this file to you under the MIT license.
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; See the LICENSE file in the project root for more information.
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;
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; void itoa(char *buf, int num, int base)
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;
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itoa:
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mov ax3, 1
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jmp ltostr
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;
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; void utoa(char *buf, int num, int base)
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;
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utoa:
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nul ax3
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jmp ltostr
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;
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; void ltostr(char *buf, int num, int base, bool signed)
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;
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ltostr:
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mov eax, ax0
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nul ecx
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; make sure base is in [2, 32]
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bltu ax2, 2, .bad
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bltu 36, ax2, .bad
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; deal with zero
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bzr ax1, .is_zero
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; deal with base 10 signedness
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bzr ax3, .conv
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bne ax2, 10, .conv ; base 10
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shr ecx, ax1, 63 ; extract ax1 sign
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jrcxz .conv
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neg ax1 ; NEG if negative
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; main loop
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.conv:
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bzr ax1, .fini
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rem edx, ax1, ax2 ; ax1 % base
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blt 9, edx, .nondec ; edx > 9 ?
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add edx, '0'
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jmp .next
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.nondec:
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add edx, 55 ; 'A' - 10
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.next:
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mov b[ax0], edx
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inc ax0
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div ax1, ax2
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jmp .conv
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; add minus flag, null-terminate and reverse
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.fini:
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jrcxz .cxz
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mov b[ax0], '-'
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inc ax0
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.cxz:
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nul b[ax0]
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call strrev2, eax
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ret
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;
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; exceptional cases
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;
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.bad:
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mov b[ax0], 0
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ret
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.is_zero:
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mov b[ax0], 48 ; '0'
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mov b[ax0+1], 0
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ret
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